Hello, We are considering changing the arch to a rectangle & replacing the other two windows. The new rectangle would be 36 x 72 and the others are 32 x 26. The cheapest quote of five estimates has been $4000 for Andersen 100 series. We have never replaced windows, but this seems kinda high to us? Also, the frames will be black(along with new black storm door) and we like the idea of putting horizontal cladding in ipe color in that area. We just had a composite deck installed in ipe and we love the look. Appreciate any thoughts/suggestions on window cost/composite cladding idea. Thank you